Concentrator.



PATENTEDJMAI 14, 1907. J. Fr ISBELL- GONGENTRATOR.

APPLIO'ATION FILED O0T.17, 1904.

' 4 sums-$115121 1.

PATENTED MAY 14; 1907.

J.-P. ISBELL. I

GONGENTRATOR.

APPLIOATID'NPILED 0013.17, 19o4.

4 SHEETS-SHEET. :3.

wih pwom @w? N0.'s53.459. PATENTED MAY 14, 1907.

. J. F. ISBELL.

GONGENTRATOR. ArPLIoA'TIon FILED 001211. 1904.

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JOHN F. ISBELL, OF DENVER, COLORADO.

CQNCENTRATOR- I Specification of Letters Patent.

Patented May 14, 1907.

Application filed October 17, 190 1-- Serial No. 228,683.

To CLZZ whom it may concern.-

Be it known that I, JOHN F. ISBELL, a citizen of the United States, residing in the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Concentrators; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings and to the letters and figuresof reference marked thereon, which form a part of this specification.

y invention relates to improvements in concentrators or apparatus adapted to separate the metallic values from substances with which the said values are mingled whether the material to be treated is in the shape of pulverized ore or placer dirt, the latter being the term generally used to designate material carrying the precious metal values in the free state. This invention belongs to that class of concentrators which are subjected to a longitudinal vibratory movement, for the purpose of stratifying the material under treatment, whereby the values which are heaviest are caused to settle to the bottom or form the lowest stratum of material under the vibratory action of the table.

My improved table is provided at suitable intervals wlth cut ofls, whereby the top or upper stratum of the material forming a part of the gangue, is removed, and in order to maintain a uniform or approximately bIllform thickness of material upon the table, the width of the latter diminishes from the head toward the tail of the table, that is to say the portion of the table beyond the first cut ofl is narrower than that nearer the head of the table, and so on after each cut off. This cut oil structure constitutes an important feature of my invention which is of sufficient scope to cover a construction provided with one or a plurality of cut offs as may be desired. The mechanism for imparting the vibratory action to the table may be of any suitable construction. IIence nothing is claimed in this application upon the speci'lic devices employed for accomplishing this object.

Having briefly outlined my improved con struction I will proceed to describe the same in detail reference being made to the accompanying drawingin which is illustrated an embodiment thereof.

In this drawing, Figure 1 is a top plan view of my improved concentrator. Fig. 2 is a side elevation of the same. Fig. 3 is a top view of the front part of the apparatus shown on a larger scale and in connection with suitable means for imparting the vibratory moti on. Fig. 4 is an elevation of the same partly in section. Fig. dis a top view of the lower or tail extremity of the table shown on a larger scale than in Figs. 1 and 2. Fig. 6 is a longitudinal section of the same. Fig. 7 is a transverse section taken on the line 66 Fig. 4.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a suitable stationary bed, above which are mounted two channel bars 6 pivotally connected with the base at one extremity as shown at 7, their opposite extremities being vertically adjustable by means of a screw 8 engaging a nut 9 connected with the channel bars, the lower extremity of the screw bearing against the base as shown at 10. It is evident that by adjusting this screw the channel bars may be held in a horizontal or inclined position as may be desiredj Mounted on these channel bars and extending transversely thereof, are angle pieces 12 to which are attached flexible upright parts 13 which may be formed of some tough wood, or of metal having sufficient spring to allow them an oscillatory1novement to permit the necessary vibration of the superstructure supported by these uprights. As shown in the drawing, to the upper extremities of the springs 13 are secured. the

angle bars 14, the latter being in turn madefast to the side pieces 15 forming the bodyof the frame work of the table. Between these side pieces is mounted and suitably secured the table proper which I will designate in its entirety by the numeral 16. This table consists of a bottom 17, upwardly projecting sides 18 and longitudinally disposed riffles 19. As shown in the drawing the table maybe said to be divided into three sections designated A, A and A respectively. Between the sections A and A there is a downwardly-proj ecting part A While between the parts A and A there is a downwardly projecting part A. Located directly above each of these inclined parts A and A is located a cut off plate B whose forward extremity projects slightly forward of the inclined part A or A of the table as the case n'nty be and stillieiciiitly raised tl'LCLUlIOlIl, to remove the upper 5 stratum ol' the material under treatment, be-

ing the light worthless portion ordinarily termed gangue. The forward extremity of this cut-oil plate, enters grooves Formed inthe rear extremities of the riilles 1.9.

Forward. of the part B of the cut oil plate, the latter bi'lf'u'rcated and consists ol' two parts B having side llanges. These two parts diverge from each other and discharge into a trough located ui'iderneath the r 5 table, extending transversely thereof, and

projecting therelrom on opposite sides to receive the gangue discharge from the parts B of the cut oil. The material which passes .below the cut off plate, passes down the 20 incline of the table to the next section which as heretofore stated is preferably reduced in width in order to maintain a depth of the material on the table equal to that before the gangue was removed through the instru- 'ZS\11lel1tiblit} of the cut oil. As a large proportion of the water is removed with the gangue, it is necessary at each cut oil to introduce more water. This is done through the instrumentality of a main supply pipe 21 hav- 3o ing branches 22 extending transversely of the table and provided with downwardly projecting nozzles 23 which pass through the cut ofr plate, their lower extremities being bent downwardly or toward the tail oil the 3 5 table. As shown in the drawing there is one of these nozzles 23 for every other rifl'le upon the table section nearer the head. Hence where a nozzle commences continued. In other words the number of riffies on the inclined parts A and A of the table, is only one-half as great as that upon the table section above. By thus removing the lower extremities of anumber of the rifiles, the nozzles are allowed a free dischar e,thus 4 5 overcoming any tendency which oterwise might exist, for the material to clog at the upper extremity of the cut off. After the material has passed beneath the first cut off, it is further Stratified upon the next section of the table and after passing over that table section, another top stratum is removed, thus further depriving the material under treatment of its gangue or worthless portion. The material which passes below this cut oflf, is thus further concentrated or reduced. in bulk, and consequently the width of the table section next below is less than that im mediately above for the purpose heretofore explained. This operation may be continued to any extent desired. Hence there may be as many out ofis as may be deemed advisable or necessary, depending on the material mt der treatment and the necessities of any par ticular case, or the peculiarities of the ore or 6 5 other material under treatment.

the riflles are dis The dil Tcren t cut oil's between the head and the tail of the table are substantially oi the san'ie construction, except that they diminish .in area from the head toward the tail of the table, since the amount 01 material to be handled diminishes in the direction of the tail or loot ol' the table. At the tail oi? the table, however, .1; have shown a special cut oil construction consisting of a l'iorizontally disposed. plate 24 having rill'lc plates 25 spaced to correspond with the rillles 19 on tie tail section of the table. These riliie plates 25 have their forward extremities formed Vshaped as shown at 26, to engage grooves of corresponding shape Formed in metal extremities 27 with which the ri'llics 19 are provided. To the top of the rillle plates 25 is secured. a bearing plate 28, and above this plate is located a yoke 29 whose depending extremities are secured to the sides 15 of the table. Passing through an inverted opening in the top 29 of this yoke, is a screw 30 whose lower extremity is made last to the bearing plate 28 and to whose upper extremity is applied a nut 31 engaging the threaded part of the screw, whereby the parts 24 and 25 may be adjusted. Surrounding the screw and between the top of the yoke and the bearing plate 28, is a coil spring 82, whose tension is sufficient to hold tie parts 24 and 25 in the lowest possible position when the nut 31 is adjusted. It is evident that when this nut is turned to raise the parts 24 and 25, the spring 32 will be compressed or placed under tension, while when this nut is turned in the opposite direc tion, whereby the nut is raised, the spring will act to throw the parts downwardly, whereby the nut is kept in contact with the upper surface of the yoke.

in order to keep the riiile plates 25 in close engagement with the riffle parts 27, the said plates are provided with a transverse bearing piece 33 against which bears a bow-shaped spring 34 acted on by a screw 35 threaded in a piece 36 connected with the sides 15 of the table by corner pieces 37. Just in front of the riflleplates 25, are located depending nozzles or water pipes 38 which enter 0 enings 39 formed in the parts 27 of the ri ies. These openings 39 terminate at the rear edges of the riflle plates 27 whereby there is a discharge of water below the cut off plate 24 when the latter is properly adjusted. The material which goes above the plate 24, is the portion of the gangue finally separated from the material under treatment, while the material which goes below said plate constitutes the concentrates. The concentrates pass into a trough or receptacle 40, while the gan gue passes into another trough or receptacle 4 When the apparatus is in use, the material under treatment is discharged from a suitable feed receptacle 42 mounted above the TOO uppermost section of the table and provided with channels 43 leading downwardly to the riffled portion of the table, the number of channels corresponding with the spaces between the riflies of this section of the table.

The vibratory motion is imparted to the 1 table through the instrumentality of a rocking lever 44 fulcrumed at its lower extremity l as shown at 45 and connected at its upper extremity as shown at 46 with a pitman 47 whose extremity remote from the lever is connected with an eccentric strap 48 in which works an eccentric 49 mounted on a shaft 50 provided with pulleys 51. This shaft is suitably journaled and the fast pulley may be connected with any suitable motor. Between the lever and the forward extremity of the table, is interposed a link 52 whose extremities take bearing in the lever as shown at 53 and in the table structure as shown at- 54, respectively. In order to maintain the arts of the mechanism in operative relation, the bottom of the table is provided at a suitable point withan eyebolt 55 with which is connected the rear extremity of a tension rod 56, the forward extremity of the rod passing through a stationary bracket 57. To the forward extremity of this rod is attached an adjustable stop 58 which bears against a coil spring 59 interposed between the parts 57 and 58. This spring holds the table tightly against the forward extremity of the link 52 as will be readily understood. It is evident that when the shaft 50 is rotated, a longitudinal vibratory movement will be imparted to the table. Under the in- .fluence of this vibratory action, the material fed to the table as heretofore explained is stratified on the upper section A of the table, and a portion of the gangue removed therefrom by the first cut off. i The material which passes below the cut off is treated in like manner on the section A of the table next below and another portion of the gangueremoved by the next cut off. The material which passes below the last named cut off, passes to the section A of the table where it is further Stratified, and the final separation of the gangue from the concentrates effected by the cut off plate 24 at the tail of the table as heretofore explained. During this operation the necessary water for the performance of the concentrating function is'supplied through the instrumentality of the main pipe 21, the branches 2-2 and the nozzles 23 and 38 as heretofore explained,

Having I claim is:

1. A rifiied concentrating table having a vibratory movement in the direction of its length, the riffles also extending longitudinally of the table, the vibratory action of the table being adapted to cause the material to travel from the .head toward the tail of the table, thelatter consisting of sections arranged at different elevations and in stepped order, the head section of the table being highest and so on toward the tail of the table, each table section being provided with a cut off adapted to remove a suitable depth from the top of the material under treatment,

thus described my invention, what the various table sections diminishing in p width from the head toward the tail of the table to compensate for the gangue removed at the cut offs in order to maintain an approximately uniform depth of material on the various table sections, and means-for introducing water beneath each cut offto com pensate for that removed with the gangue above the cut offs.

2. A concentrating table having a movement whose tendency is to cause the material to travel thereon from the head toward the tail of the table, the said table being composed of a number of sections diminishin in width from the head toward the tail of the table, each section having a distinct series of longitudinally disposed riflles, a cut off located at the rear extremity of each table section and arranged to remove the upper portion of the material undertreatment as the latter leaves the said section, and means for introducing water underneath each cut off to compensate for that passing above the cut off, there being passages beneath the cut offs whereby the table sections communicate with each other.

In testimony whereof I aflix my signature in presence of two witnesses.

JOHN F. ISBELL.

Witnesses DENA NELsoN, A. J. OBRI N. 

